noun, Physics. 1. a frame of reference in which a body remains at rest or moves with constant linear velocity unless acted upon by forces: any frame of reference that moves with constant velocity relative to an inertial system is itself an inertial system.noun 1. a frame of reference within which bodies are not accelerated unless acted upon by external forces Also called inertial reference frame

inertia time n. The interval elapsing between the reception of the stimulus from a nerve and the contraction of the muscle.

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